flask之学习安装学习1

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  1. pip install virtualenv
  2. virtualenv ve
  3. source ve/bin/activate
  4. pip install Flask
  • 第一个demo hello.py
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    from flask import Flask
    app = Flask(__name__)
    @app.route('/')
    def hello_world():
        return 'Hello World!'
    if __name__ == '__main__':
        app.run()
*不要使用flask.py,这会与 Flask 本身发生冲突,否则如下错误*

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(ve)yann@yann-computer:~/workspace/flask_workplace/demo1$ python flask.py 
Traceback (most recent call last):
  File "flask.py", line 1, in <module>
    from flask import Flask
  File "/home/yann/workspace/flask_workplace/demo1/flask.py", line 1, in <module>
    from flask import Flask
ImportError: cannot import name Flask
  • 第二个demo 
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    from flask import Flask
    app = Flask(__name__)
    @app.route('/')
    def index():
        return 'Index Page'
    @app.route('/hello')
    def hello():
        return 'Hello World'
    @app.route('/user/<username>')
    def show_user_profile(username):
        # show the user profile for that user
        return 'User %s' % username
    @app.route('/post/<int:post_id>')
    def show_post(post_id):
        # show the post with the given id, the id is an integer
        return 'Post %d' % post_id
    if __name__ == '__main__':
        app.run(host='127.0.0.1', port=8080,debug=True) #更改端口，debug模式
        #app.run()

现有的转换器有：











int接受整数
float接受浮点数
path和缺省情况相同，但也接受斜杠

  • 消息闪现

    例子地址，消息闪现其实就是用户操作后，给用户的提示